<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
</head>
<body>
    <!-- 过滤器 -->
    <div id="app">
        {{msg | format(2)}}
    </div>
    <script>
        var vm=new Vue({
            el:"#app",
            data:{
                msg:99.3542
            },
            filters:{
                /* val就是msg */
                format(val,params){
                    return "$"+val.toFixed(params)
                }
            }
        })
    </script>
</body>
</html>